asmgarden: Question 001

Objective

Write a basic x86 assembly program that prints "Hello, World!" to the console.

Background

The "Hello, World!" program is a classic introductory program in programming. It's often used to introduce the basic syntax of a programming language.

Task

Your task is to write an x86 assembly program that uses system calls to print "Hello, World!" to the standard output (console).

Requirements

• The program must compile and run on an x86 Linux system.
• Only use system calls; do not use external libraries like printf from libc.
• The program should exit cleanly returning zero.

Solution

section .data
    hello db 'Hello, World!',0xA   ; 'Hello, World!' plus a linefeed character
    helloLen equ $ - hello         ; Length of the 'Hello, World!' string

section .text
    global _start                  ; Make '_start' the entry point of the program

_start:
    mov eax, 4                     ; 'sys_write' system call
    mov ebx, 1                     ; File descriptor 1 - STDOUT
    mov ecx, hello                 ; Pointer to the string to print
    mov edx, helloLen              ; Length of the string to print
    int 0x80                       ; Call the kernel

    mov eax, 1                     ; 'sys_exit' system call
    xor ebx, ebx                   ; Return 0 status on exit
    int 0x80                       ; Call the kernel

Assembly and Execution

1. Write and save your solution in student_solutions directory.
2. Name the file hello.asm.
3. From the parent directory, test it with docker run --rm -v $(pwd)/student_solutions:/asmcode abhinavmir/asmgarden 001 hello.asm